CN111403815B - Air-extracting and sealing method for soft package lithium battery - Google Patents
Air-extracting and sealing method for soft package lithium battery Download PDFInfo
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- CN111403815B CN111403815B CN202010229048.5A CN202010229048A CN111403815B CN 111403815 B CN111403815 B CN 111403815B CN 202010229048 A CN202010229048 A CN 202010229048A CN 111403815 B CN111403815 B CN 111403815B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
According to the air-extracting and sealing method for the soft package lithium battery, the soft package lithium battery is packaged, the air bag of the packaged soft package lithium battery is pierced, then the vacuum-extracting operation is performed on the soft package lithium battery to be extracted, the rolling operation is performed on the soft package lithium battery to be extracted while the vacuum-extracting operation is performed, and finally the heat-sealing treatment is performed on the soft package lithium battery to be heat-sealed. The gas in the soft package lithium battery can be well exhausted completely, namely the vacuum degree in the soft package lithium battery is ensured, so that the pole piece and the diaphragm cannot be fully infiltrated by electrolyte because of excessive bubbles, and the battery performance of the soft package lithium battery is reduced; in addition, the invention can also well prevent the electrolyte loss of the soft package lithium battery from being excessive, namely the electrolyte loss is in a controllable range, and the battery performance of the soft package lithium battery is also ensured.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method for sealing a soft package lithium battery by air suction.
Background
Currently, a battery refers to a device that converts chemical energy into electrical energy in a portion of the space of a cup, tank, or other container or composite container that holds an electrolyte solution and metal electrodes to generate an electric current. Has a positive electrode and a negative electrode. With the advancement of technology, batteries generally refer to small devices that can generate electrical energy. Such as a solar cell. The performance parameters of the battery are mainly electromotive force, capacity, specific energy and resistance. The battery is used as an energy source, can obtain current which has stable voltage and current, is stably supplied for a long time and is slightly influenced by the outside, has simple structure, convenient carrying, simple and easy charging and discharging operation, is not influenced by the outside climate and temperature, has stable and reliable performance, and plays a great role in various aspects of modern social life.
The kinds of batteries are various, for example, cylindrical batteries; for another example, a button cell is also called button cell; as another example, a soft pack lithium battery. The soft package lithium battery is popular with people due to a plurality of advantages. In the production process of the soft-package lithium battery, air suction sealing is a process which must be involved, and the purpose of air suction sealing is firstly that air in the soft-package lithium battery is sucked out, so that electrolyte in the soft-package lithium battery can be fully infiltrated into a pole piece and a diaphragm, and the performance of the soft-package lithium battery is more superior; second, before cutting soft packet of lithium cell's gasbag, need take the gas in the soft packet of lithium cell out the side can carry out the heat-seal operation to soft packet of lithium cell's gasbag position department, let the shaping of soft packet of lithium cell.
The air-extracting sealing method mainly comprises four steps, namely firstly, transferring the soft-package lithium battery to be subjected to air extraction into a closed vacuum cavity; secondly, puncturing the soft package lithium battery to be exhausted, namely puncturing an air bag of the soft package lithium battery to be exhausted; thirdly, exhausting the soft-package lithium battery to be exhausted, and simultaneously extruding two sides of the soft-package lithium battery once by using the clamp until the exhausting is finished; and fourthly, performing heat sealing operation on the soft package lithium battery with the exhausted gas. Although the method can realize the air extraction and sealing operation of the soft package lithium battery, some obvious defects exist, firstly, the air extraction method only performs one-time extrusion on two sides of the soft package lithium battery, and the distance from the bottom of the soft package lithium battery to a puncture opening is too far, so that a vacuum gradient is easily generated, and the vacuum degree inside the soft package lithium battery is insufficient, namely, the gas inside the soft package lithium battery is not discharged completely; in addition, because the internal gas of the soft package lithium battery is not discharged completely, a large number of bubbles are easily generated in the soft package lithium battery, and the existence of the bubbles can prevent the pole piece and the diaphragm in the soft package lithium battery from being fully soaked by the electrolyte, so that the battery performance of the soft package lithium battery is not superior enough; moreover, above-mentioned air exhaust method leads to soft packet of lithium cell's electrolyte to lose too much easily, and the electrolyte loss is not in controllable within range promptly, and the excessive loss of electrolyte not only can the polluted environment, still can produce some influences to the head that soft packet of lithium cell carried out the heat-seal simultaneously.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the air pumping and sealing method for the soft package lithium battery, which can completely discharge the gas in the soft package lithium battery and ensure the vacuum degree in the soft package lithium battery and the loss of electrolyte in a controllable range.
The purpose of the invention is realized by the following technical scheme:
a method for sealing an air exhaust of a soft package lithium battery comprises the following steps:
step S01, packaging the soft package lithium battery to obtain a packaged soft package lithium battery;
step S02, transferring the packaged soft-package lithium battery to a closed vacuum cavity, and piercing an air bag of the packaged soft-package lithium battery to obtain a soft-package lithium battery to be pumped;
step S03, performing vacuum pumping operation on the soft package lithium battery to be pumped, and rolling the soft package lithium battery to be pumped to obtain a soft package lithium battery to be heat-sealed;
and step S04, performing heat sealing treatment on the soft package lithium battery to be subjected to heat sealing.
In one embodiment, in step S03:
treat to bleed the both sides position department of soft packet of lithium cell and set up the cylinder, let lie in both sides position department the cylinder contact treat to bleed soft packet of lithium cell, it is right treat to bleed soft packet of lithium cell and carry out the roll extrusion.
In one embodiment, in step S03:
if treat the both sides limit distance scope of the soft packet of lithium cell of bleeding is [160mm, 180mm ], the cylinder is in order to keep away from a side of the gasbag of the soft packet of lithium cell of encapsulation is the starting point, lets lie in both sides position department the cylinder all toward being close to the direction of a side of the gasbag of the soft packet of lithium cell of encapsulation is removed, right treat that the soft packet of lithium cell of bleeding carries out the roll extrusion.
In one embodiment, in step S03:
if treat the both sides limit distance range of the soft packet of lithium cell of bleeding for [90mm, 110mm ], the cylinder with the central axis of the soft packet of lithium cell of encapsulation is the starting point, lets lie in both sides position department the cylinder all toward keeping away from the direction of the central axis of the soft packet of lithium cell of encapsulation removes, right treat that the soft packet of lithium cell of bleeding carries out the roll extrusion.
In one embodiment, in step S03:
the distance between the roller positioned at one side position and the contact point of the soft-package lithium battery to be pumped is in the position of the other side, and the connection distance between the roller and the contact point of the soft-package lithium battery to be pumped is within the range of [10mm, 11mm ].
In one embodiment, in step S03:
the vacuum degree of the vacuum cavity specifically comprises a first-level vacuum degree, a second-level vacuum degree, a third-level vacuum degree and a fourth-level vacuum degree, and the vacuum degree of the vacuum cavity is set to be the first-level vacuum degree, the second-level vacuum degree, the third-level vacuum degree and the fourth-level vacuum degree in sequence, so that the soft package lithium battery to be pumped is subjected to vacuum pumping operation.
In one embodiment, the primary vacuum is [300 Torr, 450 Torr ], and the secondary vacuum is [150 Torr, 250 Torr ].
In one embodiment, the three-stage vacuum is [30 Torr, 75 Torr ], and the four-stage vacuum is [10 Torr, 25 Torr ].
In one embodiment, in step S02:
and piercing the air bag of the packaged soft-package lithium battery by using a bayonet.
In one embodiment, in step S04:
and carrying out heat sealing treatment on the lithium battery to be heat-sealed in a soft package manner by using the seal head.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the air-extracting and sealing method for the soft package lithium battery, the soft package lithium battery is packaged, the air bag of the packaged soft package lithium battery is pierced, then the vacuum-extracting operation is performed on the soft package lithium battery to be extracted, the rolling operation is performed on the soft package lithium battery to be extracted while the vacuum-extracting operation is performed, and finally the heat-sealing treatment is performed on the soft package lithium battery to be heat-sealed. The gas in the soft package lithium battery can be well exhausted completely, namely the vacuum degree in the soft package lithium battery is ensured, so that the pole piece and the diaphragm cannot be fully infiltrated by electrolyte because of excessive bubbles, and the battery performance of the soft package lithium battery is reduced; in addition, the invention can also well prevent the electrolyte loss of the soft package lithium battery from being excessive, namely the electrolyte loss is in a controllable range, and the battery performance of the soft package lithium battery is also ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic flow chart illustrating steps of a method for sealing a soft-packed lithium battery by pumping in accordance with an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a soft-package lithium battery to be pumped down during rolling according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a rolled soft-pack lithium battery to be pumped according to another view in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a soft-packed lithium battery to be pumped in a rolling process according to another embodiment of the invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that, for the soft package lithium battery, the soft package lithium battery is popular due to its many advantages in battery performance. In the production and manufacturing process of the soft package lithium battery, air exhaust and sealing are processes which must be involved, and the purpose of air exhaust and sealing is that firstly, the gas of the soft package lithium battery is extracted, so that the vacuum degree in the soft package lithium battery can be ensured, and therefore, the electrolyte in the soft package lithium battery can fully infiltrate the pole piece and the diaphragm, if the electrolyte can not fully infiltrate the pole piece and the diaphragm, the battery performance of the soft package lithium battery can be reduced, and the soft package lithium battery can not be well charged and discharged after being produced; second, before cutting soft packet of lithium cell's gasbag, need take the gas in the soft packet of lithium cell out the side can carry out the heat-seal operation to soft packet of lithium cell's gasbag position department, let the shaping of soft packet of lithium cell. The air-extracting sealing method mainly comprises four steps, namely firstly, the soft-package lithium battery to be subjected to air extraction is transferred into a closed vacuum cavity; secondly, puncturing the soft package lithium battery to be exhausted, namely puncturing an air bag of the soft package lithium battery to be exhausted; thirdly, exhausting the soft-package lithium battery to be exhausted, and simultaneously utilizing the clamp to extrude two sides of the soft-package lithium battery once until the exhausting is finished; and fourthly, performing heat sealing operation on the soft package lithium battery with the completely pumped gas. Although the method can realize the air-extracting and sealing operation of the soft package lithium battery, namely, the heat sealing can be performed on the soft package lithium battery while the internal vacuum degree of the soft package lithium battery is ensured, some obvious defects exist, firstly, the air-extracting and sealing method has the advantages that in the air-extracting process of the soft package lithium battery, because only one-time extrusion is performed on two sides of the soft package lithium battery, the distance from the bottom of the soft package lithium battery to a puncture opening is too far, the internal vacuum gradient of the soft package lithium battery is easy to generate, the internal vacuum degree of the soft package lithium battery is insufficient, namely, the gas in the soft package lithium battery is not discharged completely; in addition, because the internal gas of the soft package lithium battery is not discharged completely, a large number of bubbles are easily generated in the soft package lithium battery, and the existence of the bubbles can prevent the pole piece and the diaphragm in the soft package lithium battery from being fully soaked by the electrolyte, so that the battery performance of the soft package lithium battery is not superior enough; moreover, above-mentioned air exhaust method leads to soft packet of lithium cell's electrolyte to lose too much easily, and the electrolyte loss is not in controllable within range promptly, and the excessive loss of electrolyte not only can the polluted environment, still can produce some influences to the head that soft packet of lithium cell carried out the heat-seal simultaneously.
Therefore, based on the above problems, the application discloses a soft package lithium battery sealing method that bleeds, this method can let the inside gas outgoing of soft package lithium battery clean, guarantees that the inside vacuum of soft package lithium battery and the loss of electrolyte are in controllable range.
Referring to fig. 1, a method for sealing a soft package lithium battery by air suction includes the following steps:
and step S01, packaging the soft package lithium battery to obtain the packaged soft package lithium battery.
Therefore, it should be noted that the soft package lithium battery is packaged, various components of the soft package lithium battery are obtained, and the packaged soft package lithium battery is obtained by packaging the various components. It is emphasized that the package specifically comprises the following steps: pre-packaging, injecting liquid, standing, rolling, forming and standing to obtain the packaged soft package lithium battery.
And S02, transferring the packaged soft package lithium battery into a closed vacuum cavity, and puncturing an air bag of the packaged soft package lithium battery to obtain the soft package lithium battery to be pumped.
So, need explain, after obtaining a soft packet of lithium cell of encapsulation, shift into an inclosed vacuum cavity to the soft packet of lithium cell of encapsulation, shift into an inclosed environment to the soft packet of lithium cell of encapsulation promptly under, simultaneously, pierce through the gasbag of the soft packet of lithium cell of encapsulation, prick out a entrance to a cave in the gasbag position department of the soft packet of lithium cell of encapsulation promptly, when the soft packet of lithium cell of encapsulation shifts into inclosed vacuum cavity, can carry out the evacuation operation to the soft packet of lithium cell of encapsulation.
And S03, performing vacuum pumping operation on the soft package lithium battery to be pumped, and rolling the soft package lithium battery to be pumped to obtain the soft package lithium battery to be heat-sealed.
Therefore, it needs to be explained that when the soft package lithium battery to be pumped is successfully transferred into the closed vacuum cavity, the vacuum pumping operation can be performed, the soft package lithium battery can be rolled while the soft package lithium battery is pumped, the rolling is aimed at well ensuring that the gas in the soft package lithium battery to be pumped can be discharged, and the vacuum degree in the soft package lithium battery to be pumped is ensured, so that the situation that the battery performance of the soft package lithium battery is reduced because the electrode plate and the diaphragm cannot be fully infiltrated by the electrolyte due to too many bubbles is avoided; in addition, the rolling mode can also prevent that the electrolyte loss of soft package lithium cell is too much, lets the loss of electrolyte promptly in controllable within range, also guarantees the battery performance of final soft package lithium cell equally.
And step S04, performing heat sealing treatment on the soft package lithium battery to be subjected to heat sealing.
So, what need explain is, when treating the inside clean back of gas outgoing of the soft packet of lithium cell of heat-seal, just can treat the soft packet of lithium cell of heat-seal and carry out heat-seal treatment, concrete operation, treat earlier the soft packet of lithium cell of heat-seal in the side heat-seal of gasbag position department, then treat the soft packet of lithium cell of heat-seal in the side heat-seal of gasbag position department once more, there are two heat-seal treatment promptly, then, cut the gasbag of treating the soft packet of lithium cell of heat-seal again, just can carry out subsequent work to the soft packet of lithium cell that cuts the gasbag.
It should be further noted that after step S01 is executed, the packaged lithium battery with soft package will have a self-contained air bag, and the purpose of the pre-contained air bag is to pump out the air bag for sealing, which is a necessary process in the production process of the lithium battery with soft package, and the working principle of the pre-contained air bag is not described in detail and is well known to those skilled in the art.
According to the air-extracting and sealing method for the soft package lithium battery, the soft package lithium battery is packaged, the air bag of the packaged soft package lithium battery is pierced, then the vacuum-extracting operation is performed on the soft package lithium battery to be extracted, the rolling operation is performed on the soft package lithium battery to be extracted while the vacuum-extracting operation is performed, and finally the heat-sealing treatment is performed on the soft package lithium battery to be heat-sealed. The gas in the soft package lithium battery can be well exhausted completely, namely the vacuum degree in the soft package lithium battery is ensured, so that the pole piece and the diaphragm cannot be fully infiltrated by electrolyte because of excessive bubbles, and the battery performance of the soft package lithium battery is reduced; in addition, the invention can also well prevent the electrolyte loss of the soft package lithium battery from being excessive, namely the electrolyte loss is in a controllable range, and the battery performance of the soft package lithium battery is also ensured.
Further, in one embodiment, in step S03:
set up the cylinder in the both sides position department of waiting to bleed soft packet of lithium cell, let the cylinder contact that lies in both sides position department wait to bleed soft packet of lithium cell, treat to bleed soft packet of lithium cell and carry out the roll extrusion.
So, what need explain is, in the operation process of the roll extrusion of the both sides position department of treating the soft packet of lithium cell of bleeding, set up the cylinder in the both sides position department of treating the soft packet of lithium cell of bleeding, let the cylinder contact that is located both sides position department treat the soft packet of lithium cell of bleeding, treat the soft packet of lithium cell of bleeding and roll extrusion. The rolling has the advantages that compared with extrusion, the rolling can well discharge the gas inside the soft package lithium battery to be exhausted completely, ensure the vacuum degree inside the soft package lithium battery to be exhausted, namely, excessive bubbles cannot be generated inside the soft package lithium battery to be exhausted, enable the electrolyte to fully infiltrate a pole piece and a diaphragm, and simultaneously ensure that the electrolyte inside the soft package lithium battery to be exhausted cannot be excessively lost, prevent excessive electrolyte from being lost, pollute the environment if the electrolyte is excessively lost, on the other hand, the excessive electrolyte can be retained on the side edge of the air bag position, when the heat-sealing treatment is carried out on the soft package lithium battery to be heat-sealed, as the heat-sealing needs to be carried out at certain high temperature, the heat-sealing treatment generates excessive bubbles due to the existence of the electrolyte, and when the excessive bubbles can cause subsequent PP layer in the heat-sealed soft package lithium battery to be melted and folded, too much bubble can destroy the PP layer, leads to the soft packet of lithium cell's of last output insulation resistance to descend to soft packet of lithium cell's battery performance has been influenced.
Further, referring to fig. 2, in one embodiment, in step S03:
if the distance range of the two side edges of the soft package lithium battery to be pumped is [160mm, 180mm ], the rollers take one side edge far away from the air bag of the packaged soft package lithium battery as a starting point, the rollers positioned at the positions of the two sides move towards the direction close to one side edge of the air bag of the packaged soft package lithium battery, and the soft package lithium battery to be pumped is rolled.
So, it should be noted that, when the both sides limit distance range of the soft packet of lithium cell of waiting to bleed is when [160mm, 180mm ], the both sides limit of the soft packet of lithium cell of waiting to bleed is the corresponding side of the side of gasbag position department and the side of gasbag position department promptly, AB limit and CD limit shown in figure 2 promptly, when the distance range of AB limit distance CD limit is when [160mm, 180mm ], the cylinder is with keeping away from a side of the gasbag of the soft packet of lithium cell of having capsulated as the starting point, the cylinder uses the AB limit as the starting point promptly, let the cylinder that is located both sides position department all move toward the direction that is close to a side of the gasbag that has capsulated the soft packet of lithium cell, let the cylinder that is located both sides position department all move toward the direction that is close to the CD limit promptly, treat that the.
Further, referring to fig. 4, in one embodiment, in step S03:
if the distance range of the two side edges of the soft package lithium battery to be exhausted is [90mm, 110mm ], the rollers take the central axis of the packaged soft package lithium battery as a starting point, the rollers positioned at the positions of the two sides move towards the direction far away from the central axis of the packaged soft package lithium battery, and the soft package lithium battery to be exhausted is rolled.
So, it should be noted that, when the both sides limit distance range of waiting to bleed soft packet of lithium cell is when [90mm, 110mm ], the distance range of AB limit distance CD limit that is shown in figure 4 is when [90mm, 110mm ], find out the central axis of the soft packet of lithium cell of encapsulation, IO central axis that is shown in figure 4, the cylinder uses the central axis of the soft packet of lithium cell of encapsulation as the starting point, the cylinder uses IO central axis as the starting point, let the cylinder that is located both sides position department all toward the direction removal of the central axis of keeping away from the soft packet of lithium cell of encapsulation, the cylinder that is located both sides position department all moves toward the direction on AC limit and BD limit promptly, treat to bleed soft packet of lithium cell and roll extrusion.
It should be further noted that, in the process of rolling the soft-package lithium battery to be subjected to air exhaust, the distance range between the two sides of the soft-package lithium battery to be subjected to air exhaust is determined, and according to the distance range between the two sides of the soft-package lithium battery to be subjected to air exhaust, whether rolling is performed in the rolling manner shown in fig. 2 or in the rolling manner shown in fig. 4 is determined, where most of the rolling manners shown in fig. 2 are applicable to the soft-package lithium battery which is integrally square, and most of the rolling manners shown in fig. 4 are applicable to the soft-package lithium battery which is rectangular.
Further, referring to fig. 3, in one embodiment, in step S03:
the connection distance range between the roller positioned at one side position and the contact point of the soft package lithium battery to be exhausted and the roller positioned at the other side position and the contact point of the soft package lithium battery to be exhausted is 10mm or 11 mm.
So, need explain, the cylinder that is located one side position department is [10mm with wait to bleed soft packet of lithium battery contact point distance and be located the cylinder of opposite side position department and wait to bleed soft packet of lithium battery contact point's distance range of being connected of [10mm, 11mm ], the E point that is shown in figure 3 is [10mm to the distance range of F point, 11mm ], guarantee the distance between the cylinder of both sides position department, prevent the distance undersize between the cylinder and too big to soft packet of lithium battery's effort, the inner structure of soft packet of lithium battery has been damaged, also can prevent simultaneously that the distance between the cylinder is too big and the soft packet of lithium battery of unable fine effect well, let the inside gas exhaust of soft packet of lithium battery clean.
Further, in one embodiment, in step S03:
the vacuum degree of the vacuum cavity specifically comprises a first-level vacuum degree, a second-level vacuum degree, a third-level vacuum degree and a fourth-level vacuum degree, the vacuum degree of the vacuum cavity is sequentially set to be the first-level vacuum degree, the second-level vacuum degree, the third-level vacuum degree and the fourth-level vacuum degree, and the soft package lithium battery to be pumped is vacuumized.
So, it should explain, vacuum chamber's vacuum has 4, be the one-level vacuum respectively, the second grade vacuum, tertiary vacuum and level four vacuum, when treating soft packet of lithium cell of bleeding and carrying out the evacuation operation, continuously treat soft packet of lithium cell of bleeding and carry out the evacuation, let vacuum chamber's vacuum become the one-level vacuum, continue to treat soft packet of lithium cell of bleeding and carry out the evacuation operation, let vacuum chamber's vacuum become the second grade vacuum, continue to treat soft packet of lithium cell of bleeding and carry out the evacuation operation, let vacuum chamber's vacuum become the tertiary vacuum, continue to treat soft packet of lithium cell of bleeding and carry out the evacuation operation, let vacuum chamber's vacuum become the level four vacuum. When the vacuum degree of the vacuum cavity body becomes the four-stage vacuum degree, the operation of vacuumizing the soft package lithium battery to be exhausted is stopped, and meanwhile, the rolling of the soft package lithium battery to be exhausted is also stopped.
Specifically, in one embodiment, the primary vacuum is [300 Torr, 450 Torr ], the secondary vacuum is [150 Torr, 250 Torr ], the tertiary vacuum is [30 Torr, 75 Torr ], and the quaternary vacuum is [10 Torr, 25 Torr ].
Therefore, it should be noted that the specific values of the first vacuum degree, the second vacuum degree, the third vacuum degree and the fourth vacuum degree can be flexibly set by combining the actual conditions.
Further, in one embodiment, in step S02:
and (3) piercing the air bag of the packaged soft package lithium battery by using a bayonet.
In this way, it should be noted that, when the airbag of the packaged soft-package lithium battery is pierced, the airbag of the packaged soft-package lithium battery may be pierced by using a bayonet knife, which may be a bayonet knife commonly sold in the market, and the working principle of the bayonet knife is not described in detail and is well known to those skilled in the art.
Further, in one embodiment, in step S04:
and carrying out heat sealing treatment on the soft package lithium battery to be subjected to heat sealing by using the sealing head.
Therefore, it should be noted that, when the heat-sealing treatment is performed on the to-be-heat-sealed soft package lithium battery, the heat-sealing treatment can be performed on the to-be-heat-sealed soft package lithium battery by using the end socket, and the end socket can be an end socket which is usually sold in the market, and the working principle of the end socket is not elaborated in detail and is well known by the technical personnel in the field.
According to the air-extracting and sealing method for the soft package lithium battery, the soft package lithium battery is packaged, the air bag of the packaged soft package lithium battery is pierced, then the vacuum-extracting operation is performed on the soft package lithium battery to be extracted, the rolling operation is performed on the soft package lithium battery to be extracted while the vacuum-extracting operation is performed, and finally the heat-sealing treatment is performed on the soft package lithium battery to be heat-sealed. The gas in the soft package lithium battery can be well exhausted completely, namely the vacuum degree in the soft package lithium battery is ensured, so that the pole piece and the diaphragm cannot be fully infiltrated by electrolyte because of excessive bubbles, and the battery performance of the soft package lithium battery is reduced; in addition, the invention can also well prevent the electrolyte loss of the soft package lithium battery from being excessive, namely the electrolyte loss is in a controllable range, and the battery performance of the soft package lithium battery is also ensured.
The above embodiments only express a few embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. The air extraction and sealing method of the soft package lithium battery is characterized by comprising the following steps of:
step S01, packaging the soft package lithium battery to obtain a packaged soft package lithium battery;
step S02, transferring the packaged soft-package lithium battery to a closed vacuum cavity, and piercing an air bag of the packaged soft-package lithium battery to obtain a soft-package lithium battery to be pumped;
step S03, performing vacuum pumping operation on the soft package lithium battery to be pumped, and rolling the soft package lithium battery to be pumped to obtain a soft package lithium battery to be heat-sealed;
step S04, performing heat sealing treatment on the soft package lithium battery to be subjected to heat sealing;
in the step S03:
arranging rollers at two sides of the soft-package lithium battery to be pumped, and enabling the rollers at the two sides to contact the soft-package lithium battery to be pumped so as to roll the soft-package lithium battery to be pumped;
in the step S03:
treat the both sides limit distance scope of the soft packet of lithium cell of bleeding and be [160mm, 180mm ], the cylinder is in order to keep away from a side of the gasbag of the soft packet of lithium cell of encapsulation is the starting point, lets lie in both sides position department the cylinder all toward being close to the direction of a side of the gasbag of the soft packet of lithium cell of encapsulation is removed, and is right the soft packet of lithium cell of waiting to bleed carries out the roll extrusion.
2. The air extraction and sealing method of the soft package lithium battery is characterized by comprising the following steps of:
step S01, packaging the soft package lithium battery to obtain a packaged soft package lithium battery;
step S02, transferring the packaged soft-package lithium battery to a closed vacuum cavity, and piercing an air bag of the packaged soft-package lithium battery to obtain a soft-package lithium battery to be pumped;
step S03, performing vacuum pumping operation on the soft package lithium battery to be pumped, and rolling the soft package lithium battery to be pumped to obtain a soft package lithium battery to be heat-sealed;
step S04, performing heat sealing treatment on the soft package lithium battery to be subjected to heat sealing;
in the step S03:
arranging rollers at two sides of the soft-package lithium battery to be pumped, and enabling the rollers at the two sides to contact the soft-package lithium battery to be pumped so as to roll the soft-package lithium battery to be pumped;
in the step S03:
treat the both sides limit distance scope of the soft packet of lithium cell of bleeding and be [90mm, 110mm ], the cylinder with the central axis of the soft packet of lithium cell of encapsulation is the starting point, lets lie in both sides position department the cylinder all toward keeping away from the direction of the central axis of the soft packet of lithium cell of encapsulation is removed, right treat that the soft packet of lithium cell of bleeding carries out the roll extrusion.
3. The suction sealing method for the lithium-ion pouch battery according to claim 1 or 2, characterized in that in the step S03:
the distance between the roller positioned at one side position and the contact point of the soft-package lithium battery to be pumped is in the position of the other side, and the connection distance between the roller and the contact point of the soft-package lithium battery to be pumped is within the range of [10mm, 11mm ].
4. The suction sealing method for the lithium-ion pouch battery according to claim 1 or 2, characterized in that in the step S03:
the vacuum degree of the vacuum cavity specifically comprises a first-level vacuum degree, a second-level vacuum degree, a third-level vacuum degree and a fourth-level vacuum degree, and the vacuum degree of the vacuum cavity is set to be the first-level vacuum degree, the second-level vacuum degree, the third-level vacuum degree and the fourth-level vacuum degree in sequence, so that the soft package lithium battery to be pumped is subjected to vacuum pumping operation.
5. The extraction sealing method of the lithium-ion battery pack as claimed in claim 4, characterized in that the primary vacuum degree is [300 Torr, 450 Torr ], and the secondary vacuum degree is [150 Torr, 250 Torr ].
6. The extraction sealing method of the soft-packaged lithium battery as claimed in claim 4, wherein the three-level vacuum degree is [30 Torr, 75 Torr ], and the four-level vacuum degree is [10 Torr, 25 Torr ].
7. The suction sealing method for the lithium-ion pouch battery according to claim 1 or 2, characterized in that in the step S02:
and piercing the air bag of the packaged soft-package lithium battery by using a bayonet.
8. The suction sealing method for the lithium-ion pouch battery according to claim 1 or 2, characterized in that in the step S04:
and carrying out heat sealing treatment on the lithium battery to be heat-sealed in a soft package manner by using the seal head.
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| CN202010229048.5A CN111403815B (en) | 2020-03-27 | 2020-03-27 | Air-extracting and sealing method for soft package lithium battery |
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| JPS59117060A (en) * | 1982-12-22 | 1984-07-06 | Matsushita Electric Ind Co Ltd | Production method of flat cell |
| CN101924248A (en) * | 2010-08-23 | 2010-12-22 | 东莞新能源科技有限公司 | Packaging method of soft-package lithium ion battery |
| CN205406651U (en) * | 2016-03-02 | 2016-07-27 | 宁德新能源科技有限公司 | Soft packet of secondary cell changes into system |
| CN106025145A (en) * | 2016-08-09 | 2016-10-12 | 连云港德立信电子科技有限公司 | Flexible package lithium battery two-seal liquor-drainage exhaust packaging technology |
| CN108550887A (en) * | 2018-03-14 | 2018-09-18 | 珠海格力能源环境技术有限公司 | A kind of liquid removing device and cell package machine |
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2020
- 2020-03-27 CN CN202010229048.5A patent/CN111403815B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59117060A (en) * | 1982-12-22 | 1984-07-06 | Matsushita Electric Ind Co Ltd | Production method of flat cell |
| CN101924248A (en) * | 2010-08-23 | 2010-12-22 | 东莞新能源科技有限公司 | Packaging method of soft-package lithium ion battery |
| CN205406651U (en) * | 2016-03-02 | 2016-07-27 | 宁德新能源科技有限公司 | Soft packet of secondary cell changes into system |
| CN106025145A (en) * | 2016-08-09 | 2016-10-12 | 连云港德立信电子科技有限公司 | Flexible package lithium battery two-seal liquor-drainage exhaust packaging technology |
| CN108550887A (en) * | 2018-03-14 | 2018-09-18 | 珠海格力能源环境技术有限公司 | A kind of liquid removing device and cell package machine |
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| CN111403815A (en) | 2020-07-10 |
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